Spring-Ring Heat Sink Mounting for Even Bare Die Contact

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Solution Overview

Problem

Conventional methods of attaching heat dissipation devices to bare die chips result in uneven and asynchronous force distribution, leading to potential damage and thermal resistance due to incomplete contact, which is exacerbated by the fragile nature of bare die chips.

Innovation Solution

A connecting element comprising a screw, sleeve, and turnable retaining ring is used to apply synchronous and even downward forces to the heat dissipation unit, ensuring stable contact with the bare die by using a spring mechanism that releases its elastic force simultaneously across multiple points.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If screw units are sequentially tightened at quick speed to reduce fixing time, then productivity is improved, but the bare die is easily damaged due to uneven and asynchronous force distribution

Engineering Contradiction:

Improvefixing timeVSAvoidbare die integrity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The springs are pre-compressed to a predetermined force level before the tightening operation begins. This preliminary action ensures that when the screw units are quickly tightened, the force is already distributed evenly across all corners, preventing bare die damage while maintaining high productivity

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The spring mechanism provides continuous force feedback during the tightening process. As each screw unit is tightened, the spring compression state automatically adjusts to maintain equal force distribution, creating a self-regulating system that prevents uneven force application even during rapid tightening

Inventive Principle:

Principle #23Feedback

2Productivity

If screw units are fully tightened in one movement at very quick speed, then productivity is improved, but the springs are quickly compressed causing uneven force distribution

Engineering Contradiction:

Improvetightening speedVSAvoidforce distribution uniformity

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The spring mechanism transforms the static tightening process into a dynamic one. During quick tightening, the springs compress progressively and automatically adjust their force output, maintaining uniform force distribution throughout the entire tightening motion rather than creating sudden force spikes

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If downward forces are asynchronously applied to four corners, then fixing operation is simplified, but warp occurs causing incomplete contact and thermal resistance

Engineering Contradiction:

Improvefixing operation simplicityVSAvoidthermal contact quality

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The spring mechanism creates an equipotential force distribution across all four corners of the heat dissipation device. Each spring is configured to exert equal force, ensuring that all corners reach the same compression level simultaneously, preventing warp and ensuring complete contact between the bare die and heat dissipation device

Inventive Principle:

Principle #12Equipotentiality

4Power

If the heat dissipation device is connected to the bare die, then heat dissipation function is achieved, but the bare die is subjected to damage due to uneven contact area

Engineering Contradiction:

Improveheat dissipation capabilityVSAvoidbare die damage risk

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The springs serve as cushioning elements that are pre-compressed to a controlled force level before contact with the bare die. This beforehand cushioning prevents excessive or uneven force application that could damage the fragile bare die, while still providing sufficient contact pressure for effective heat dissipation

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution prevents damage to the bare die by ensuring even force distribution, maintaining close contact and preventing thermal resistance, thus enhancing the reliability and effectiveness of heat transfer.

Implementation Method 1

the springs are no longer pressed down by the tongues and synchronously release their elastic restoring forces to provide even downward forces

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS12443247B2Connecting element for heat dissipation unit and heat dissipation unit using same

Publication Date: 2025.10.14 ASIA VITAL COMPONENTS CO LTD

AI summary

A heat dissipation unit is connected to a bare die heat source by extending connecting elements through four predetermined corners on the heat dissipation unit. The connecting elements respectively include a screw having a spring fitted therearound; a sleeve defining a receiving space for receiving the screw and the spring therein, and having a window formed near an upper end thereof to radially communicate with the receiving space; and a turnable retaining ring fitted around the upper end of the sleeve and including a tongue curled toward a center of the turnable retaining ring and being extendable through the window into the receiving space to compress the spring. When all the turnable retaining rings are turned, the tongues can be moved away from the springs, allowing the springs to release their elastic force synchronously and push the heat dissipation unit toward the bare die heat source evenly for heat exchange.